Well the title pretty much sums it up, I'm looking to do the s grill in Big Bear, anybody familiar with the trails up there that the race will be on? I currently own a road bike and a mountain bike. No gravel bike. Is it worth trying to rent one or should I just slap some slick cross country tires on my mountain bike and call it a day?

For reference my mountain bike is an intense primer, dual suspension 130 mm.